Objective To evaluate the effect of gilding technique on the element release from Vera Bond Ni- Cr- Be alloy exposed to artificial saliva. Methods To measure the quantity of beryllium ion which was released from common used Ni- Cr porcelain crown（controlling group）, polished Ni- Cr porcelain crown（polished group）, gilded Ni- Cr porcelain crown（gold- plating group） and gilded Ni - Cr porcelain crown prolonged 50%（gold - plating prolonged 50% group） in artificial saliva after 1 month, 3 months and 6 months by means of ICP- AES. So the effect of released beryllium ion with different treatments and the rule of different times with the same treatment were compared. Results The quantity of released beryllium ion was statistic significant among different treatments. The quantity of released beryllium ion was gradually increased with the same treatment. At the end of this experiment, it was reached the highest. The speed of released beryllium ion was gradually decreased with the same treatment. At the end of this experiment it was reached the lowest. Conclusion The gilding treatment can decrease the quantity of beryllium ion which released from Ni- Cr porcelain crown, and improve the biocompatibility.
